Geo 365: July 15, Day 196: Bioturbation

Bioturbation, probably feeding traces/burrows, in a siltstone or fine grained sandstone in the south cove of Devils Punchbowl State Park, Oregon. This is a loose boulder, but it's certainly from the cliffs nearby, which are composed of the Miocene Astoria Formation.

Photo unmodified. July 2, 2013. FlashEarth location.